Carding rolls



1959 J. D. HOLLINGSWORTH 2,900,672

CARDING ROLLS Filed March 12, 1958 Fl E13.

/9 INVENTORZ JOHN D. HOLLINGSWORTH ATTYS.

2,900,672 Patented Aug. 25, 1959 2,900,672 CARDING RoLLs John D. Hollingsworth, Greenville, S.C. Application March 12, 1958, Serial No. 720,974

3 Claims. c1. 19112 This invention relates to an improvement in carding rolls and more particularly in carding rolls of the type having end plates that extend to or beyond the peripheral face of the shell of the roll.

Almost all cotton card doffer rolls originally designed for fillet card clothing, were equipped with such end plates. In subsequently applying metallic card clothing to these doifer rolls, it has been the practice to start the foundation for the new clothing at the inner face of the end plate, and to start the toothed surface wire at a point inside the terminal end of the foundation, and therefore relatively remote from the end plate and from the effective end of the roll. This resulted in a substantial reduction in the overall effective axial length of the doffer roll, i.e. the axial length of the clothing. Frequently this involved also a reduction in the effective length of the doffer roll as compared with the effective length of the complementary card roll so that the doffer roll was unable to remove the fibre stock over the entire length of the card roll. Stock at the extreme ends of the card roll which should have been transferred to the doifer roll was not so transferred and this stock working off of the end of the carding roll tends to blow off or in some cases to build up on the ends of the card roll with resultant malfunction in the carding process, added expense of production, faulty work, and loss of stock. Even when the efiective lengths of the dolfer and carding rolls are the same there is frequently a marked tendency toward accumulation of residual fibre stock at the ends of the card roll.

A principal object of the invention is to provide effective means for preventing such accumulation of residual fibre stock at the ends of the roll.

Another object is to provide a simple and practical means for avoiding the aforesaid loss of effective axial length in doffer rolls in the process of conversion from fillet foundation clothing for which the roll was originally designed to the more desirable metallic card clothing.

The invention will be more readily understood by refer ence to the attached drawings wherein:

Fig. l is a fragmentary end elevational and partial sectional view showing a carding roll and a complementary doffer roll in their normal relative positions of assembly;

Fig. 2 is an enlarged fragmentary sectional view on the line 2-2, Fig. 1, and

Fig. 3 is a fragmentary sectional view illustrating a modification within the scope of the invention.

Heretofore it has been customary to make the faces of a carding roll and its complementary dolfer roll equal in effective axial length. Under these conditions and particularly where the clothing does not extend to the extreme ends of the rolls, as for example in rolls which were originally designed for fillet card clothing and have been converted to the metallic card clothing, there is a tendency for the doifer roll to leave a residual part of the fibre stock at the extreme edges untransferred and adhering to the card rolls or cylinders. This residual stock tends to work off the end of the roll, or blows off; and in some cases builds up on the end of the card cylinder and on the nose of the card cylinder screen at both ends of the latter. When this residual untransferred stock builds up on the nose of the screen to the point where it reaches the dotfer it drags the surface of the deposited stock with the result that the stock is roughened at the ends or selvage edges so that it becomes pilly and has the appearance of containing small balls which continues in the stock through further processing and is a cause of imperfection and poor quality in the finished stock. Also stock not removed by the doffer and working or blowing from the ends of the card roll tends to pack between the ends of the rolls and the frame of the machine, and if the machine is not stopped and this build-up removed, the operation of the machine may be seriously affected. This necessity for hooking and clearing out the stock not only materially increases the cost of the operation and the time consumed but also results in a loss of potentially good fibre stock.

I have found that if the face of the dofier clothing is made to exceed the face of the cylinder clothing in axial length preferably to the extent of A or more at each end, there is a substantially complete transfer of the fibre stock from the cylinder to the doffer with resultant mate rial saving in time and expense and avoidance of the undesirable effects described above resulting from residual fibre stock accumulation on the cylinder.

In the drawings 1 is a card cylinder and 2 a complementary dolfer roll. In normal operation these rolls rotate in the directions indicated by the arrows. In Fig. l the conventional card cylinder screen is indicated by the reference numeral 3.

Fig. 2 shows the cylinder 1 equipped withmetallic card clothing in accordance with the procedure disclosed in my US. Patent 2,816,325. The shell ofthe cylinder is indicated at 4 and is grooved circumferentially at the ends as indicated at 5 for receptionof foundation end wire 6. Foundation wires 7 are laid on the cylinder between the end wires 6 at the respective opposite ends of the cylinder and, with the end wires, form a foundation for the metallic card clothing 8. The toothed metallic clothing wire is confined between clothing end wires 9 set in grooves 11 in the end wires 5.

In accordance with conventional practice the dofi'er roll 2 comprises a shell 12 and an end plate 13 at each end of this shell. This is a type of dolfer roll designed for fillet card clothing, and in the original structure the end plates 13 were extended radially slightly beyond the peripheral surface of the shell 12 in order to contain the outer edges of the fillet clothing. In converting this roll to metallic card clothing, and in accordance with the present invention, I take advantage of the presence of the end plates 13 to extend the effective length of the cylinder and of the metallic card clothing so that it may exceed the corresponding axial length of the metallic clothing of the cylinder 1. To this end, the end plates 13 are reduced in diameter so that they conform precisely to the cylindrical surface of the shell 12 and in effect form continuations of that surface. The foundation end wire 141's then extended in axial width so as to seat upon the plate 13 and in the present instance the outer face of the end wire occupies the same radial plane as the outer face of the plate 13. The end wire 14 is of the same essential construction as the end wire 6 described above and in my aforesaid prior patent but the additional axial width of the wire permits the location of the recess or groove 15 for the clothing end wire 16 in a position outwardly beyond the position of the corresponding end wire 9 of the cylinder 1 and thereby provides for extension of the metallic clothing at both ends of the doifer roll beyond the corresponding edges of the clothing of the cylinder 1. This is clearly shown in Fig. 2. Thus while the clothing in both cases terminates short of the ends of the respective cylinders, the clothing of the doffer roll is of greater length axially than the clothing of the cylinder and extends at both ends beyond the end of'the latter. As indicated above, this has been found to insure a practically clean and complete transfer of the fibre stock from the cylinder to the dofier roll 2.

Fig. 3 shows a doffer roll 17 of the type originally designed for fillet card clothing and comprising the typical end plate -18. In this case a different form of foundation end wire 19 is used which is held in place on the shell of the roll 17 by a pin 21. In accordance with the present invention this end wire is extended at the end of the roll so as to seat upon the peripheral edge of the end plate 18 which has been reduced in diameter to conform to the diameter of the roll shell, as illustrated. In this case the end wire has been extended somewhat beyond the outer face of the end plate 18 so as to further increase the effective axial length of the roll by extension at each end of the metallic clothing 22.

I claim:

1. In a roll for carding machines, a cylindrical shell, an end plate at each end of said shell, metallic card clothing forming the working face of the roll, and a foundation for said clothing on the cylindrical surface of the shell, said foundation including clothing-supporting elements embracing the peripheral surfaces of the end plates.

2.. A roll according to claim 1 wherein the said clothing supporting elements consist of foundation end wires anchored to and extending beyond the axial limits of the shell and over the end plates.

3. A roll according to claim 2 wherein the peripheral surfaces of the end plates have the same diameter as and form extensions of the peripheral surface of the shell.

References Cited in the file of this patent UNITED STATES PATENTS 852,330 Kehoe Apr. 30, 1907 2,175,131 Schwartz Oct. 3, '1939 2,340,221 Hollingsworth Jan. 25, 1944 2,607,958 Rusca et al. Aug. 26, 1952 2,816,325 Hollingsworth Dec. 17, 1957 

